The use of devices for voice communication, for example, cellular and digital telephone systems.
- Cellular telephone systems
- Centrex telephone systems
- Digital telephone systems
- Telephone switching systems
This category has the following 5 subcategories, out of 5 total.
Pages in category "Telephony"
The following 130 pages are in this category, out of 130 total.
Media in category "Telephony"
The following 8 files are in this category, out of 8 total.